<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="login-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="article.aut_photo" />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>

          <follow-user :is-followed.sync="article.is_followed" :user-id="article.aut_id" />
          <!-- <van-button v-if="article.is_followed" @click="onFollow" class="follow-btn" round size="small" :loading="loading">已关注</van-button>
          <van-button v-else @click="onFollow" class="follow-btn" type="info" color="#3296fa" round size="small" icon="plus" :loading="loading">关注</van-button> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body" v-html="article.content" ref="article-content"></div>
        <van-divider>正文结束</van-divider>

        <!-- 文章评论列表 -->
        <comment-list :source="article.art_id" :list="commentList" :total-count.sync="totalCount" @onload-success="totalCount = $event" @reply-click="onReplyClick" />

        <!-- 底部区域 -->
        <div class="article-bottom">
          <van-button class="comment-btn" type="default" round size="small" @click="isPopupShow = true"> 写评论 </van-button>
          <van-icon name="comment-o" :badge="totalCount" color="#777" />
          <!-- <van-icon color="#777" name="star-o" /> -->
          <collect-article :is-collected.sync="article.is_collected" :article-id="article.art_id" />
          <van-icon color="#777" name="good-job-o" />
          <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->

        <!-- 发表评论 -->
        <van-popup v-model="isPopupShow" position="bottom">
          <comment-post :target="article.art_id" @post-success="onPostSuccess" />
        </van-popup>
        <!-- /发表评论 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 回复评论 -->
    <van-popup v-model="isReplyShow" position="bottom" :style="{ height: '100%' }">
      <!-- 重点：v-if=false是销毁元素或组件 -->
      <comment-reply v-if="isReplyShow" :comment="currentComment" @close="isReplyShow = false" />
    </van-popup>
  </div>
</template>

<script>
import './github-markdown.css'
import { getArticleById } from '@/api/article.js'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import CollectArticle from '@/components/collect-article'
import CommentList from './components/comment-list'
import CommentPost from './components/comment-post'
import CommentReply from './components/comment-reply'

export default {
  name: 'ArticleIndex',
  components: {
    'follow-user': FollowUser,
    'collect-article': CollectArticle,
    'comment-list': CommentList,
    'comment-post': CommentPost,
    'comment-reply': CommentReply,
  },
  provide: function () {
    return {
      articleId:this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true,
    },
  },
  data() {
    return {
      article: {},
      loading: true,
      errStatus: 0,
      totalCount: 0,
      isPopupShow: false,
      commentList: [],
      isReplyShow: false,
      currentComment: {},
    }
  },
  computed: {},
  watch: {},
  created() {
    this.loadArticle()
  },
  mounted() {
    //为什么还是不行？
    // console.log(this.$refs['article-content'])
  },
  methods: {
    async loadArticle() {
      try {
        this.loading = true
        const { data: res } = await getArticleById(this.articleId)
        this.article = res.data

        // 获取dom元素
        // console.log(this.$refs['article-content']);
        setTimeout(() => {
          this.previewImage()
        }, 0)
      } catch (err) {
        //   console.log(err);
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
        this.$toast('获取文章失败')
      }
      this.loading = false
    },
    previewImage() {
      let imgs = this.$refs['article-content'].querySelectorAll('img')
      //   console.log(imgs);
      let images = []
      imgs.forEach((item, i) => {
        images.push(item.src)
        item.onclick = function () {
          ImagePreview({
            images,
            startPosition: i,
          })
        }
      })
    },
    // 评论发表成功
    onPostSuccess(comment) {
      // 2.关闭对话框
      this.isPopupShow = false
      // 3.发表的评论追加到评论列表中
      this.commentList.unshift(comment.new_obj)

      // 4.文章评论条数+1
      this.totalCount++

    },
    onReplyClick(comment) {
      // console.log(comment);
      this.currentComment = comment
      this.isReplyShow = true
    },
  },
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>